module top_module (
    input [4:0] a, b, c, d, e, f,
    output [7:0] w, x, y, z );//

    // assign { ... } = { ... };
    assign {w, x, y, z} = {{a, b[4:2]}, {b[1:0], c, d[4]}, {d[3:0], e[4:1]}, {e[0], f, 2'b11}};

endmodule
